>>You need a route via the loopback to make this work. This should be
>>added automatically if you use /etc/ifaliases. I believe 'ifconfig' adds
>>this automatically when you add the "primary" address.
>>(e.g. my machine has a route via loopback for it's primary ethernet's
>>ip address)
>>
>>'route add $alias 127.0.0.1'
>
> basically, BSD code does not really expect to have multiple interface
> addresses from the same prefix (for example, 10.1.1.1/24 and
> 10.1.1.2/24). there are many assumption made about it, including
> in_ifinit(). as it is critical requirement for IPv6, KAME team is
> trying to cook up better code (it is not yet merged into *BSD).
> we will need to bring it back to IPv4 too, it seems.
it struck me at one point that the only thing needed (and perhaps i'm
way over-simplifying this) is for ip_output() to do the same checks
that ip_input() does in looking for local addresses.
if that was done...all this would be moot because we wouldn't need to
add loopback routes for all non-loopback addresses, whatever flavor
they may be.
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